Home / 20,985.20-31,420.20-16,377.20

Finding the Fourth Proportional to 20,985.20, 31,420.20 and 16,377.20

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Solution

The fourth proportional to 20,985.20, 31,420.20 and 16,377.20 is: 24,520.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.20 : 31,420.20 = 16,377.20 : x
  2. Step 2: Convert to fraction form
    20,985.20/31,420.20 = 16,377.20/x
  3. Step 3: Cross multiply
    20,985.20x = 31,420.20 × 16,377.20
  4. Step 4: Simplify right side
    20,985.20x = 514,574,899.44
  5. Step 5: Solve for x
    x = 514,574,899.44/20,985.20
  6. Step 6: Final answer
    x = 24,520.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.